Which changes take effect within days?
Changes to crawler access have the shortest documented delays. OpenAI says that, for search results, its systems can take about 24 hours to adjust after a robots.txt update. Perplexity says changes may take up to 24 hours to be reflected. Google says a change to the Search generative AI control in Search Console generally takes a few days to exclude a site's content from AI features, with some content taking longer because of caching. These delays cover permission only. They tell you when a crawler may visit or when an exclusion applies, and nothing about when a page will be cited.
How long does Google take to see a page change?
Google's recrawl documentation says crawling can take anywhere from a few days to a few weeks, and that requesting a crawl does not mean the page will be included in results instantly or at all. An owner or full user of the Search Console property can request a recrawl of individual pages with the URL Inspection tool, and a sitemap helps for many pages. Google says there is a quota for individual requests and that asking repeatedly for the same URL does not speed it up. In its AI features guidance, Google says crawling can take from several days to several months, depending on how often its systems decide a page needs refreshing.
Why do some AI answers lag behind your website?
An assistant can answer from its model's training data, from a live search, or from both. The part that comes from training data reflects the web at the time the model was trained, and it changes only when the operator releases an updated model. Operators do not publish a schedule a business can plan around. The part that comes from a live search can pick up your corrected page once it has been crawled and indexed, but it can also pick up an older copy of the detail on another site. That is why a fix can show in one assistant while another still repeats the old version.
Why do results move from week to week?
Answers are generated afresh for each question, and the same question can produce different wording and different businesses on different runs. Google says AI Mode and AI Overviews may use different models and techniques, so the links they show will vary, and that AI Overviews appear only when its systems judge them useful. The search results feeding the answers also change as other sites publish and update pages. A weekly movement in a handful of prompt checks is therefore weak evidence. Look at the same questions over several months and judge the pattern.
What is a sensible measurement schedule?
Set the schedule before work starts and keep it regardless of early results, so nobody is tempted to measure only on good days. The baseline comes first: the full set of buyer questions, run and saved before any change. Crawler access fixes can be confirmed in server logs within days. Page changes need Google's recrawl time before any effect can be expected. Prompt checks then run at a fixed interval with the same questions and settings.
Hypothetical example: a business fixes a CDN rule blocking OAI-SearchBot and rewrites four service pages. It saves a baseline of 30 questions before the work, checks its logs a few days after the CDN change, confirms in Search Console a few weeks later that the edited pages have been recrawled, and reruns the 30 questions once a month for six months before judging the result. These numbers are illustrative assumptions.
What should a provider tell you about timing?
A provider should separate documented delays, such as robots.txt processing, from estimates, such as when answers might change. Be cautious of anyone who promises your business will be named within a fixed number of weeks, because no operator publishes when its models will next be updated or how its answers choose businesses. Ask instead when each piece of work will be delivered, when each measurement will be taken and what will be compared. For Yes AI's own work, timing is confirmed in your written quote after a short scoping conversation.